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10 open-source alternatives for small business software

Email: Thunderbird Email is the primary method of communication for most businesses. There are a number of paid and free email clients available, but Microsoft Outlook is one of the most widely used. Outlook is part of the Microsoft Office Home & Business package, as well as the more expensive Microsoft Office Professional suite, or it can be purchased separately for $95.

Calendar: Lightning Another function that most businesses rely on Microsoft Outlook for is the calendar. With all your appointments, conference calls, sales meetings, and deadlines, you need a robust calendar tool to manage your days.